Process for the preparation of plastic casein.



and Raoon Dnscnonon,

OFFICE,

FRANQOIS LEBBEIL, OF VILLEURBANNE, RHfiNE, AND RAOUL DESGEORGE, 0F LYON, FRANCE.

PROCESS FOR THE PREPARATION OF PLASTIC CASEIN.

No Drawing.

To all whom it may concern Be it known that we, FnANgoIs LEBREIL citizens of the French Republic, residing, respectively, at Villeurbanne, Rhone, and Lyon, both in France, have invented a certain new and useful Improvement in Processes for the Preparation of Plastic Casein, of which the following is a specification.

The process which forms the object of the present invention is for the urpose of obtalning a plastic casein whic may be formed into sheets similar to celluloid It is preferable to operate on a casein pre-,

pared in the following manner which gives a homogeneous fermentation in all the mass:

About 250 liters of skimmed milk is heated in an open and preferably steam-heated vessel to a temper-Rule of degrees centigrade and about 300 cubic centimeters of commercial rennet is then added. Immediately coagulation commences the temperature of the mass is raised rapidly to 75 degrees (1., when the heating steam is cut off and at this moment the casein takes a cel- Speeiflcation of Letters Patent.

Patented July 4, 1916 Application filed December 8, 1911. Serial No. 664,672.

lular appearance and rises above the vessel. This cellular state resembling that of bread crumbs allows of determining by microscopic examination the degree of fermentation which is suitable to the application for which the product is required. The casein thus obtained is then exposed for about 12 hours upon screens arranged in a chamber heated to 1 5 degrees C. The development of acetic bacteria (Mycoclerma aceti) in the mass can then be ascertained and this development is sufficient to now commence to treat the substance with the acetone. The development of bacteria can be arrested or lessened by the addition of a mineral salt or acid to the mass or by cooling the same.

What we claim as our invention and desire to secure by Letters Patent of the .United States is 1 The herein described process for the production of a casein adapted to the working" FRANCOIS LEBREIL. RAOUL DESGEORGE.

Witnesses:

GASTON YEAUNIAUX, MoNIAs N. BROWN. 

